Understanding the dual mobility concept for total hip arthroplasty. Investigations on a multiscale analysis-highlighting the role of arthrofibrosis
Understanding the dual mobility concept for total hip arthroplasty. Investigations on a multiscale analysis-highlighting the role of arthrofibrosis
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DOI：
10.1016/j.wear.2011.02.027
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发表时间：
2011-07-29
期刊：
影响因子：
5
通讯作者：
Farizon, F.
中科院分区：
文献类型：
--
作者：
Geringer, J.;Boyer, B.;Farizon, F.
在髋关节植入物中，UHMWPE（超高分子量聚乙烯）内衬磨损被认为是影响人工关节寿命的关键问题。双动性是一种THA（全髋关节置换术）概念，其中内衬在金属髋臼杯内移动，由于其脱位率低而变得流行。为了了解这种特定植入物的摩擦学行为，特别是第二移动性的作用，从250个外植体库中选择了12个代表性外植体。使用的植入物为Profil（R）股骨柄和Novae（R）金属髋臼杯。外表面，参与第二流动性，通过三维轮廓术，扫描电子显微镜（SEM）和坐标测量机（CMM）进行了检查。这项研究突出了粗糙度和CMM演变和手术参数之间的相关性。一个特定的磨损区域和磨损情况进行了识别和验证，根据金属背的类型。隔离了金属背衬和衬垫之间的金属转移。CMM允许在宏观尺度上测量第二移动磨损体积。因此，针对该特定植入物提出了一种现实的磨损机制。(C)2011爱思唯尔有限公司版权所有。
In hip implants, UHMWPE (ultra high molecular weight polyethylene) liner wear is believed to be a key issue affecting the lifetime of the artificial joint. Dual mobility, a THA (total hip arthroplasty) concept where the liner moves inside the metallic shell, has become popular due to its low dislocation rate. To understand the tribological behavior of this particular implant, especially the role of the second mobility, 12 representative explants were selected from a bank of 250 explants. The implants used were Profil (R) femoral stem and Novae (R) metallic shell. The external surface, involved in the second mobility, was examined by 3D profilometry, SEM (scanning electron microscopy) and CMM (coordinate measuring machine). This study highlights a correlation between roughness and CMM evolutions and surgical parameters. A particular wear zone and a wear scenario were identified and validated according to the type of metal-back. A metal transfer between the metal back and the liner was isolated. CMM allowed to measure second mobility wear volume at a macroscopic scale. Thus a realistic wear mechanism has been suggested for this specific implant. (C) 2011 Elsevier B.V. All rights reserved.